Earthquake with magnitude of ML 4.6 on date 20-05-2012 and time 17:38:14 (UTC) in region 6 km NW Finale Emilia (MO)

A magnitude ML 4.6 earthquake occured in region: 6 km NW Finale Emilia (MO), on

  • 20-05-2012 17:38:14 (UTC)
  • 20-05-2012 19:38:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.88, 11.253 at 4 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV integrato con i dati della Rete Sismica di emergenza.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Finale Emilia MO 6 15699 15699
San Felice sul Panaro MO 10 10900 26599
Bondeno FE 13 14655 41254
Camposanto MO 14 3201 44455
Felonica MN 14 1359 45814
Sant'Agostino FE 14 6853 52667
Medolla MO 15 6308 58975
Sermide MN 15 6189 65164
Mirandola MO 15 23875 89039
Magnacavallo MN 15 1561 90600
Calto RO 15 743 91343
Poggio Rusco MN 15 6625 97968
Castelmassa RO 16 4252 102220
Ficarolo RO 16 2438 104658
San Giovanni del Dosso MN 17 1248 105906
Castelnovo Bariano RO 17 2762 108668
Cento FE 17 35686 144354
Villa Poma MN 17 2023 146377
Mirabello FE 17 3266 149643
Ceneselli RO 18 1719 151362
Carbonara di Po MN 18 1297 152659
Salara RO 18 1160 153819
Cavezzo MO 18 7026 160845
Schivenoglia MN 19 1203 162048
Pieve di Cento BO 19 7019 169067
Borgofranco sul Po MN 19 784 169851
Crevalcore BO 19 13465 183316
Gaiba RO 20 1063 184379

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Ferrara (133155 inhabitants)
31 Km E of Carpi (70699 inhabitants)
37 Km NE of Modena (184973 inhabitants)
43 Km N of Bologna (386663 inhabitants)
47 Km W of Rovigo (51867 inhabitants)
53 Km E of Reggio nell'Emilia (171345 inhabitants)
65 Km SE of Verona (258765 inhabitants)
69 Km NW of Imola (69797 inhabitants)
73 Km E of Parma (192836 inhabitants)
76 Km SW of Padova (210401 inhabitants)
78 Km SW of Vicenza (112953 inhabitants)
83 Km NW of Faenza (58541 inhabitants)
91 Km NW of Ravenna (159116 inhabitants)
96 Km NW of Forlì (117913 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and updated as more data become available. See http://shakemap.ingv.it for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15, https://doi.org/10.13127/cpti/cpti15.3).
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 4.6 2012-05-20
17:38:14
44.8798 11.2532 4 2014-09-19
08:14:18
Bollettino Sismico Italiano INGV integrato con i dati della Rete Sismica di emergenza 5890491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2012-05-20 17:38:14 ± 0.06
Latitude 44.8798 ± 0.0018
Longitude 11.2532 ± 0.0051
Depth (km) 4 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> REMO-INGV
Event type earthquake
Origin ID 5890491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 808
Semi-minor axis of confidence ellipse (meter) 450
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 345
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 112
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.0693
Epicentral distance of station closest to the epicenter (degree) 0.03867
Epicentral distance of station farthest from the epicenter (degree) 0.39031
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:4.6

Field Value
Value 4.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 5890491
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2014-09-18 12:47:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NOVE.EHZ. 2012-05-20T17:38:33.32 1.0 undecidable manual S 258 0.3903 1.73 0.81
IV.NOVE.EHZ. 2012-05-20T17:38:22.83 1.0 undecidable manual P 258 0.3903 -0.21 0.56
IV.RAVA.EHZ. 2012-05-20T17:38:22.91 0.1 negative manual S 218 0.1565 -0.02 0.08
IV.MODE.HNZ. 2012-05-20T17:38:22.24 0.6 negative manual P 221 0.331 -0.05 0.27
IV.FIU.EHZ. 2012-05-20T17:38:21.30 1.0 undecidable manual P 145 0.2932 0.34 0.81
IV.SERM.HNZ. 2012-05-20T17:38:21.98 0.6 negative manual S 13 0.134 0.04 2.18
IV.T0811.EHZ. 2012-05-20T17:38:20.26 0.1 positive manual S 191 0.098 0.05 0.08
IV.T0812.EHZ. 2012-05-20T17:38:20.34 0.6 undecidable manual S 326 0.0908 -0.07 0.33
IV.T0822.EHZ. 2012-05-20T17:38:19.78 0.3 positive manual S 126 0.0809 0.18 0.17
IV.RAVA.EHZ. 2012-05-20T17:38:18.58 0.1 negative manual P 218 0.1565 0.01 0.05
IV.SERM.HNZ. 2012-05-20T17:38:18.03 0.3 negative manual P 13 0.134 -0.05 0.68
IV.T0812.EHZ. 2012-05-20T17:38:17.04 0.6 undecidable manual P 326 0.0908 -0.09 0.34
IV.T0813.EHZ. 2012-05-20T17:38:17.88 0.1 positive manual S 267 0.0387 0 0.08
IV.T0811.EHZ. 2012-05-20T17:38:17.05 0.1 positive manual P 191 0.098 -0.06 0.05
IV.T0822.EHZ. 2012-05-20T17:38:16.86 0.3 positive manual P 126 0.0809 0 0.16
IV.T0813.EHZ. 2012-05-20T17:38:15.96 0.1 positive manual P 267 0.0387 0.02 0.05
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MODE.HNE. ML:4.7 0.197 0.7 AML other m 2012-05-20T17:38:43.66
IV.MODE.HNN. ML:4.7 0.198 1.32 AML other m 2012-05-20T17:38:44.05
IV.TREG.HNE. ML:4.2 0.0265 0.46 AML other m 2012-05-20T17:38:41.33
IV.TREG.HNN. ML:4.4 0.041200001 0.28 AML other m 2012-05-20T17:38:42.98
IV.ZEN8.HNE. ML:4.3 0.02375 1.58 AML other m 2012-05-20T17:38:47.43
IV.ZEN8.HNN. ML:5 0.09875 0.44 AML other m 2012-05-20T17:38:46.20
IV.VOBA.HNE. ML:4.6 0.0366000005 0.2 AML other m 2012-05-20T17:38:49.84
IV.VOBA.HNN. ML:4.7 0.0465 1.02 AML other m 2012-05-20T17:38:48.87
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download